Melinda Hearst arrives on the moon as the fiancée of Alex Riger, military commander of the Earth Federal Government overseeing the lunar colonies, amidst escalating tensions between colonists and Earth. When rebel forces led by Dog McCoy attack Alex Riger's convoy, Melinda is captured and held hostage by the insurgents.

During captivity, extensive interactions with Shun Nonomura, a young colonist aligned with the rebels, unfold. Shun's curiosity about Earth prompts questioning, leading to conversations where Melinda gains insight into the harsh realities and perspectives of the lunar settlers. This exposure fosters her sympathy for their plight and grievances against Earth's oppressive governance.

Following her release or escape, Melinda returns to Earth. Driven by her lunar experiences and newfound understanding, she attempts to advocate for the colonists' cause and promote change within the Earth Federal Government, striving to bridge the divide and address demands for better treatment and autonomy. However, the Earth authorities show no willingness to compromise or alter their policies toward the lunar colonies.

Her background includes being the daughter of a high-ranking Earth Federal Government official, a connection offering potential influence on her access or approach but ultimately failing to sway the government's stance.